Serena Williams writes in emotional Facebook post on police violence

Tennis great Serena Williams, 35, took to her Facebook to write on the growing Police/ Black people violence in the United States, saying she won't be silent on the issue..

In the post, she wrote that she had asked her 18-year-old nephew to drive her somewhere so she could work during the journey.

But that when she saw a police car she "remembered that horrible video of the woman in the car when a cop shot her boyfriend" and"All of this went through my mind in a matter of seconds," she added.